A. walk
B.walking
C.to walk
D.walked
A. starts
B.started
C.would start
D.had started
A. took
B.make
C.earned
D.scored
A. performed
B.operated
C.functioned
D.carried
A. watch
B.to watch
C.watching
D.watched
A.lowered
B.climbed down
C.descended
D.stepped
A.joined
B.connected
C.joined in
D.involved
A.went
B.set foot
C.set a food
D.set feet
A.silence
B.freedom
C.communication
D.peace
A.space
B.orbit
C. height
D.distance
A. The world
B. An astronaut
C.A mission
D.A space shuttle
A.Four
B.Five
C. Six
D. Seven
A.The supplies
B.The disasters
C. The Space Stations
D.The different eras
A.1981
B.1986
C.2003
D. 2011
A.A doctor
B.A teacher
C. A reporter
D.A scientist
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